Mi-ra, in her late 40's, has been living in Paris for around 20 years. Having just divorced her French husband, she decides to visit Korea, and meets her old friends, Yeong-eun and Seong-woo. While having a cheerful time in a bar, Mi-ra goes to the restroom and upon returning, finds out that time has reversed back to 19 years ago. It is the day of Mi-ra's farewell party, before she left for France.